Download the command-line utility. Make sure that nuget.exe goes to your Ubuntu installation. In my case, I downloaded it to a Windows host and copied it to my Ubuntu Virtual Machine via a Samba shared drive.

Copy nuget.exe to /usr/bin/nuget (or if you like it, you can keep the .exe extension)

Now create and go to a folder where you want to start your Akka.NET project. Run the following command to download the correct certificates:

mozroots --import--sync

And now you can install Akka.NET via nuget. Make sure that nuget has execution rights on you Ubuntu system. From your Akka project folder: